CAIE A-Level Physics 24.1.5 Ultrasound Intensity Reflection Coefficient

Practise calculating intensity reflection coefficients at ultrasound boundaries from acoustic impedances, then finding transmitted intensity or percentage.

Exam points

calculate the intensity reflection coefficient at a boundary using the acoustic impedances
calculate transmitted intensity or percentage from the reflection coefficient

[Maximum number: 2]

Two media have specific acoustic impedances $Z_{1}$ and $Z_{2}$ .

State the approximate value of the intensity reflection coefficient at the boundary between the two media when:
- $\quad Z_{1}$ is almost equal to $Z_{2}$

intensity reflection coefficient =

- $\quad Z_{1}$ is very different from $Z_{2}$ .
intensity reflection coefficient =

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24.1.5—IR / I0 = (Z1 – Z2)2 / (Z1 + Z2)2 for the intensity reflection coefficient question 1